noun
dilute acid
Technical term used in chemistry to refer to an acid that has been diluted with water.
実験では希酸を扱うときは注意が必要です。
When handling dilute acid in experiments, caution is required.
濃酸 means 'concentrated acid', the opposite of 希酸.
Compound of 希 (dilute, rare) and 酸 (acid). The exact historical derivation is uncertain, but the term is a straightforward technical compound.